Using BPR will cause some upset. I play by myself a lot with randoms sometimes going against full teams. While my individual effort can make an effect Halo 4 is no longer a backpack game. My stats have soured in comparison to previous Halos. However I still know I can take out many people with a higher 'BPR.'
You should do more that just a limitation of BPR. Back in old KSI, Ego Killers was compromised of some of the best players from each division. Make an effort at contacting each division to form their own tournaments and teams. They can move up to competing against other divisions.
Through 'open' tournaments you have more options for recruitment.